CVE-2026-19873Network attack vector

Unauthenticated service interruption via unbounded repeat count

Published Aug 31, 2026 · Updated Aug 31, 2026

Resource exhaustion in FormFu HTML::FormFu through 2.08 allows remote attackers to interrupt service with a crafted query parameter. The Repeatable process method accepts any positive counter_name value and deep-clones its child subtree that many times without a maximum. An application must expose a Repeatable element with counter_name; a plain unauthenticated GET can then consume CPU and memory until the hosting service becomes unavailable.

CVSS severityUnavailable
Unscored
EPSS probability0.52%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Resource exhaustion in FormFu HTML::FormFu through 2.08 allows remote attackers to interrupt service with a crafted query parameter. The Repeatable process method accepts any positive counter_name value and deep-clones its child subtree that many times without a maximum. An application must expose a Repeatable element with counter_name; a plain unauthenticated GET can then consume CPU and memory until the hosting service becomes unavailable.

The record

CVE
CVE-2026-19873
Published
Aug 31, 2026
Updated
Aug 31, 2026
Vendor
FormFu
Product
HTML::FormFu
Classifications
CWE-400, T1499.003
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 31, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 31, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <=2.08

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

FormFu · HTML::FormFuversion=0 <=2.08

Published CVSS scores

No CVSS assessment is available in this record.

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-400Uncontrolled Resource Consumption
T1499.003Application Exhaustion Flood

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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